Option D I pick, as after comma, for continues the sentence in the correct way and before comma, ignorance for the crime is right as others are incorrect

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One of the informants eventually professed ignorant of the crime, having fear that his testimony would lead to reprisals against him by his former confederates.


(A) ignorant of the crime, having

Ignorant is an adjective here. The word is not defining anything in the case of this sentence. Thus, ignorant is not the right word form here

(B) ignorantly of the crime, with

Same reason as A

(C) ignorance of the crime, since

Ignorance is a noun, which is appropriate for this sentence. However, the word since is inappropriate here since it is not making any comparison or contrast.

(D) ignorance of the crime, for

Correct word form and the right use of punctuation. For is appropriately used as the part of the sentence which comes after for is describing a reason

(E) to have ignorance of the crime, since

Same as A and C
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